There was a combined approximately $4 million of land and rural real estate for sale in Illinois's Mason County recently on Land.com. The total acreage of all Mason County land for sale was 1,000 acres. Mason County ranks 88th out of 102 counties in the Land of Lincoln for the combined amount of land currently advertised for sale. Among cities in Mason County with land and rural real estate for sale, Manito had the most land for sale. Mason County is the 47th largest county (563 square miles) in Illinois. It's located in the Western Illinois region of Illinois.